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 Add this item to the list  Hydnopolyporus Reid, gen. nov.
   
Description type:Latin diagnosis 
Description:Hydnopolyporus Reid, gen. nov.
Sporophora lignicola, distincta vel caespitosa. Pileus albus, coriaceus, irregulariter integroflabelliformis vel ramosior, ramis complanatis, apice saepe incurvo-circinato, demum dentatoincisis pectinatisque. Superficies hymenialis auf verrucis, spinis, vel dentibus foliiformibus interrupte radiantibus auf dentibus obsoletis, reticulato-connexis deinde poroideis ornatis. Hyphae 2.5-10 µm diametro, hyalinae, ramosae, septatae, sine fibulis, tenuiter vel crasse tunicatae. Cystidia et gloeocystidia absentia. Sporae hyalinae, leves, haud amyloideae, late ellipsoideae vel ovoideae 4-5 x 3-3.75 µm. - Typus: Polyporus fimbriatus Fr.

The systematic position of the genus Hydnopolyporus also presents something of a problem. It cannot be retained in the Thelephoraceae but could be placed in either the Polyporaceae or Hydnaceae on the basis of the hymenial configuration of the two species. If a choice had to be made I would be inclined, at least temporarily, to place Hydnopolyporus in the Polyporaceae.
Hydnopolyporus hartmannii differs from H fimbriatus in having a more highly dissected pileus in which the segments are narrow strap-like and bear short lateral spinose processes arranged in a pectinate manner along their length. The hymenial surface of H. hartmannii is covered with isolated warts, spines and short ridges, but unlike H. fimbriatus these do not seem to become united into pores. The hyphae of H. hartmannii are also narrower on average [mostly 4-5(-7) µm] than those of H fimbriatus (8-10 µm).
Lloyd (1913b) grouped H. hartmannii with the stipitate stereoid fungi as did Burt (1920). Both these authors attempted to distinguish between this fungus and Stereum anastomosans (see page 141). Burt (l.c.) suggested that this could be done on the basis of whether the plants were laterally stemmed or merismatoid respectively, but this is quite unsatisfactory in practice. Martin (1944) writing of Stereum hartmannii stated that "There is no suitable genus to receive such a fungus . . .", but Welden (1958) transferred it to the genus Cotylidia Karst. However, this choice of genus is unfortunate since to retain Cotylidia as a natural genus it has to be restricted to those stipitate stereoid fungi with monomitic hyphal construction in which the hyphae lack clamp-connexions and in which there is a thickening hymenium. In addition the species of Cotylidia should all possess long, cylindrical, protruding cystidia and elliptical (not broadly elliptical to ovoid) spores.
Hydnopolyporus hartmannii is known from the Southern United States, the West Indies and Bolivia. Hydnopolyporus fimbriatus has a similar distribution and is known from the Southern United States, the West Indies, Bolivia, Venezuela, Brazil and the Argentine.
 
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